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We have developed technologies for a high-output light source consisting of blue laser diodes and a reflective phosphor wheel for next generation 4K Ultra-Short-Throw Projector, and have achieved a fluorescence output of 87 W. As far as we know, it is the highest fluorescence output for projectors. We adopted a newly developed phosphor cooling mechanism and an inorganic binder for high reliability of the phosphor wheel. Therefore, no deterioration in the phosphor wheel could be observed over a time period of 7,500 hours. In this paper, we report on these lightsource technologies for achieving high output and high reliability.

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We investigated the laser-phosphor light source by using inorganic phosphor wheel. We experimentally confirmed the light extraction efficiency of the inorganic phosphor wheel which is 8% higher than conventional phosphor wheel. In addition, we explain about the cause of improvement of the efficiency by showing fluorescence emission model.

We developed a red-enhanced laser-phosphor light source with quantum dot conversion layer for projector applications. This device uses dual-layer wheel structure, in which a quantum dot layer is underneath a Ce:YAG phosphor layer. We demonstrated a high brightness and wide color gamut QDbased light source.